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I've been running into this trailing の particle quite often and can't seem to understand what exactly it means. Is it replacing か, or does it mean something else?

For example:

まだ生{い}きているの？

rurouniwallace
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Julian
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  • Related: http://japanese.stackexchange.com/questions/514/what-exactly-is-%E3%81%AA%E3%81%AE-nano –  Oct 17 '13 at 07:37

3 Answers3

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"Instead of 「か」, real questions in casual speech are usually asked with the explanatory の particle or nothing at all except for a rise in intonation"

http://www.guidetojapanese.org/learn/grammar/question

HAL
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  • I know that's not your own comment, but I would say questions in casual speech are ***often*** asked with `の`, but not ***usually***. I guess it might depend on the region, though. – istrasci Oct 17 '13 at 14:54
  • The questioning の's polite equivelant is のですか, not simply か. – Angelos Aug 18 '15 at 18:40
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To add to what 無色受想行識 said, の is regularly used in conjunction with interrogative words, such as in どこに行くの？or 何を食べるの？ Often when no interrogative word is used, rising intonation will mark that the sentence is a question, such as in 明日、パーティに行く？

Additionally, の　can be used to indicate surprise or disbelief. For example, 

A: 明日、パーティに行くよ。
B: 行くの？

In this instance, B probably thought A wasn't going to the party, and is surprised to learn that he is.

alexhatesmil
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    The last part about surprise is correct depending on the context BUT I just want to add that the question の and the surprise の are pronounced differently by us native speakers. The latter is pronounced more like のお compared with a short の in asking questions. –  Oct 20 '13 at 02:04
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To put it as directly as possible, based on my experiences and learning, the best way to describe the article の appearing at the end of questions, after verbs, is to convey a stronger sense of curiosity than simply asking the question without it. If you're familiar with the んですか？[noun]なんですか？ construction, it plays a similar role.

You might think of it as:

お手洗いはどこありますか？　＝ Where's the bathroom?
お手洗いはどこあるの？あるんですか？= Where's the bathroom?(I really need to go!)

何をしている？= What are you doing?
何をしているの？= What in the world are you doing?/What are you doing?(Tell me! I wanna know!)

(Disclaimer: This isn't a super natural phrasing for this question. It was bent to fit my example. お手洗いはどこですか？ is much more common.)

Seralyn Campbell
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